Advent Launch Services finally has a decent website: Advent Launch ServicesTher are a few photo's under technology: developmental progress and in the news section they say Nasa will test their methane engine to check the converting of a test stand to methane. But there are rumors Nasa will no longer use methane for the VSE, so this testing could be scrapped.
They are also on the vendor list of NASA's Commercial Orbital Transportation Services (COTS): Vendor list so they seem to be alive and well.